Centrifugal casting-box.



G. '0. CLARK. CENT RIFUGAL CASTING BOX:

,1918. 1,300,123 I Patented Apr. 8,1919.

INVENTOR 666mg? Caz/"k WITNESSES W' ATTORN 8 UNITED STATES PATENT OFFICE.

GEORGE C. CLARK, 0F DETROIT, MICHIGAN, ASSIGNOR T0 GEORGE C. CLARK METAL LAST 00., 0F MISHAWAKA, INDIANA, A CORPORATION OF INDIANA.

CENTRIF UGAL CASTING-BOX.

Specification of Letters Patent.

Patented A .1-. s, 1919.

Application filed July 19, 1918. Serial No. 245.724.

To ol/ whom it may concern lie it known that 1', (inoaon C. CLARK, a citizen of the l'nited States, and a resident of Detroit. in the county of \Vayne and State of Michigan. have invented a new and Improved Centrifugal Casting-Box, of which the following is a full, clear, and exact description. 4

The invention relates to a centrifugal casting machine such as shown and described in the Letters Patent of the l'nited States. Number 1,263,208, granted to me on April 16. 1918.

The object of the present invention is to provide a new and improved centrifugal casting box arranged to insure the formation of cast rings or bands of high tensile strength and without danger of cracking the east rings especially along the peripheral faces thereof. Another object is to prevent undue adhesion ofthe molten metal to the inner surface of the casting box thus allowing ready removal of a cast ring from the box. I

With these and other objects in. view, the invention consists of certain novel features of construction as hereinafter shown and de scribed and then specific-ally pointed out in the claims.

A practical embodiment of the invention is represented in the accompanyingdrawings forming a part of this specification, in which similar characters of reference indiate corresponding parts in all the views,

Figure 1 is a sectional side elevation of the casting box;

Fig. 2 is a sectional face view of the same on the line 2-2 of Fig. l; and

Fig. 3 is a similar view of the same on the line of Fig. 1.

The .casting box in its general construction comprises a back 10, a rim 11 and a cover 12. of which the back 10 is adapted to be secured to the driven shaft to rotate the box at a high speed. The rim l1 preferabl v extends integrally from the box 10. The cover 12 is provided with a central opening 1.3 for the passage of a spout which delivers the molten metal to the interior of the casting box. as more fully shown and described in the patent above referred to. The cover 12 is preferably hinged at .14 to the rim ll of the casting box to allow of swinging the cover into closed position prior to pouring the metal into the casting box and into open position after the ring is cast to allow removal of the cast ring from the casting box. Suitable locking devices,- which need not further be described here, hold the cover 12 locked when in closed position.

The back 10 and-the rim 11 have their inner faces joined by a fillet 15 to permit convenient removal of the cast ring or band from the box after the cover 1:2 is detached. The inner surface of the rim 11 is roughened preferably by providing the said inner surface with longitudinally extending ribs or teeth 20 which extend from the front face of the rim to the fillet 15. Similar ribs or teeth 21 are formed on the inner surface of the back 10 and extend from the fillet 15 radially a distance toward the center of the back, as plainly indicated in Figs. 1 and 3. The inner surface of the cover 1:2 is provided with radially disposed ribs extending from the inner face of the rim 11 to the wall of the opening 13 in the cover 12, as plainly indicated in Figs. 1 and 2. In practice, the inner ends of the ribs 21 on the back 10 terminate approximately opposite the inner ends of the ribs 2:2. It will be noticed that by the arrangement described the ribs 20, 21 and 22 form a retaining means for the molten metal to insure firm adherence. of the molten metal to the inner faces of the casting box thus effectively compact ing the grains of copper and other metal with a view to increase the density and co hesion of the grains and to produce a cast ring of high tensile strength. It has also been found that by the use of the ribs the cast ring is not liable to crack especially along the peripheral face thereof as is the case with centrifugal casting boxes as heretofore constructed.

Having thus described my invention, I claim as new and desire to secure by Letters Patent x 1. A revoluble casting box provided on its inner face with minute integral annular and uninterrupted contacting and retaining means adapted to be engaged by the contacting faces of the ring formed by the molten metal )oured into the box.

2. A revolu le casting box. comprising a back, a rim and a removable cover provided with a central opening for the introduction of the molten metal, the inner faces of the said back, rim, and cover being provided with minute integral cont-acting and retaining means for the molten metal poured into the box. 3. A revoluble casting box, comprising a back, a rim and aremovable cover provided with'a central opening for the introduction of the. molten metal, the inner faces of the said back, rim and cover being .provided with minute integral contacting and retaining ribs, of Which the ribs on the rim extend approximately arallel to the axis of the casting box an the ribs on the back and cover are disposed approximately radially. 4'. A revoluble casting box having a back, a rim, a fillet connecting the inner faces of the back and rim with each. other, and integral annular and uninterrupted retaining means on theinner face of the back adjacent the said fillet. I 5. A revoluble casting box having a back provided on its inner face with integral annular retaining means for the molten metal poured into the box.

6. A revoluble casting box having a back provided on its inner face with integral retaining ribs extending'approximately radially relative to the axis of the casting box.

7. A revoluble casting box having a cover provided at its inner face with integral annular retaining means for the molten metal poured into the box.

8. A revoluble casting box having a cover provided with a central opening and pro-. vided at its inner face with integral retainin ribs extending approximately radially re ative to the axis of the casting box.

9. A revoluble casting box, comprising a back and rim, the back and rim being joined by a fillet, and the inner faces of the said rim and back being provided with minute, integral retaining means adjacent the said fillet.

10. A1 revoluble casting box, comprising a back and a rim, the back and rim being joined by a fillet, and the inner faces of the said rim and back being provided with minute, integral retaining ribs, of which the ribs of the rim extend'approximately parallel to the axis of the casting box from the front edge of the rim to the said fillet and the ribs of the said back extend approximately radially from the said fillet toward the center of the back.

GEORGE C. CLARK. 

